libavformat/yuv4mpegdec.c

   1 /*
   2  * YUV4MPEG demuxer
   3  * Copyright (c) 2001, 2002, 2003 Fabrice Bellard
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "libavutil/avstring.h"
  23 #include "libavutil/imgutils.h"
  24
  25 #include "avformat.h"
  26 #include "demux.h"
  27 #include "internal.h"
  28 #include "yuv4mpeg.h"
  29
  30 /* Header size increased to allow room for optional flags */
  31 #define MAX_YUV4_HEADER 128
  32 #define MAX_FRAME_HEADER 80
  33
  34 static int yuv4_read_header(AVFormatContext *s)
  35 {
  36     char header[MAX_YUV4_HEADER + 10];  // Include headroom for
  37                                         // the longest option
  38     char *tokstart, *tokend, *header_end;
  39     int i;
  40     AVIOContext *pb = s->pb;
  41     int width = -1, height  = -1, raten   = 0,
  42         rated =  0, aspectn =  0, aspectd = 0;
  43     enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE, alt_pix_fmt = AV_PIX_FMT_NONE;
  44     enum AVChromaLocation chroma_sample_location = AVCHROMA_LOC_UNSPECIFIED;
  45     enum AVFieldOrder field_order = AV_FIELD_UNKNOWN;
  46     enum AVColorRange color_range = AVCOL_RANGE_UNSPECIFIED;
  47     AVStream *st;
  48     int64_t data_offset;
  49
  50     for (i = 0; i < MAX_YUV4_HEADER; i++) {
  51         header[i] = avio_r8(pb);
  52         if (header[i] == '\n') {
  53             header[i + 1] = 0x20;  // Add a space after last option.
  54                                    // Makes parsing "444" vs "444alpha" easier.
  55             header[i + 2] = 0;
  56             break;
  57         }
  58     }
  59     if (i == MAX_YUV4_HEADER) {
  60         av_log(s, AV_LOG_ERROR, "Header too large.\n");
  61         return AVERROR(EINVAL);
  62     }
  63     if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC))) {
  64         av_log(s, AV_LOG_ERROR, "Invalid magic number for yuv4mpeg.\n");
  65         return AVERROR(EINVAL);
  66     }
  67
  68     header_end = &header[i + 1]; // Include space
  69     for (tokstart = &header[strlen(Y4M_MAGIC) + 1];
  70          tokstart < header_end; tokstart++) {
  71         if (*tokstart == 0x20)
  72             continue;
  73         switch (*tokstart++) {
  74         case 'W': // Width. Required.
  75             width    = strtol(tokstart, &tokend, 10);
  76             tokstart = tokend;
  77             break;
  78         case 'H': // Height. Required.
  79             height   = strtol(tokstart, &tokend, 10);
  80             tokstart = tokend;
  81             break;
  82         case 'C': // Color space
  83         {
  84             static const struct {
  85 #define MAX_PIX_FMT_LENGTH 8
  86                 char name[MAX_PIX_FMT_LENGTH + 1];
  87 #undef MAX_PIX_FMT_LENGTH
  88                 enum AVPixelFormat pix_fmt;
  89                 enum AVChromaLocation chroma_loc;
  90             } pix_fmt_array[] = {
  91                 { "420jpeg",  AV_PIX_FMT_YUV420P,   AVCHROMA_LOC_CENTER      },
  92                 { "420mpeg2", AV_PIX_FMT_YUV420P,   AVCHROMA_LOC_LEFT        },
  93                 { "420paldv", AV_PIX_FMT_YUV420P,   AVCHROMA_LOC_TOPLEFT     },
  94                 { "420p16",   AV_PIX_FMT_YUV420P16, AVCHROMA_LOC_UNSPECIFIED },
  95                 { "422p16",   AV_PIX_FMT_YUV422P16, AVCHROMA_LOC_UNSPECIFIED },
  96                 { "444p16",   AV_PIX_FMT_YUV444P16, AVCHROMA_LOC_UNSPECIFIED },
  97                 { "420p14",   AV_PIX_FMT_YUV420P14, AVCHROMA_LOC_UNSPECIFIED },
  98                 { "422p14",   AV_PIX_FMT_YUV422P14, AVCHROMA_LOC_UNSPECIFIED },
  99                 { "444p14",   AV_PIX_FMT_YUV444P14, AVCHROMA_LOC_UNSPECIFIED },
 100                 { "420p12",   AV_PIX_FMT_YUV420P12, AVCHROMA_LOC_UNSPECIFIED },
 101                 { "422p12",   AV_PIX_FMT_YUV422P12, AVCHROMA_LOC_UNSPECIFIED },
 102                 { "444p12",   AV_PIX_FMT_YUV444P12, AVCHROMA_LOC_UNSPECIFIED },
 103                 { "420p10",   AV_PIX_FMT_YUV420P10, AVCHROMA_LOC_UNSPECIFIED },
 104                 { "422p10",   AV_PIX_FMT_YUV422P10, AVCHROMA_LOC_UNSPECIFIED },
 105                 { "444p10",   AV_PIX_FMT_YUV444P10, AVCHROMA_LOC_UNSPECIFIED },
 106                 { "420p9",    AV_PIX_FMT_YUV420P9,  AVCHROMA_LOC_UNSPECIFIED },
 107                 { "422p9",    AV_PIX_FMT_YUV422P9,  AVCHROMA_LOC_UNSPECIFIED },
 108                 { "444p9",    AV_PIX_FMT_YUV444P9,  AVCHROMA_LOC_UNSPECIFIED },
 109                 { "420",      AV_PIX_FMT_YUV420P,   AVCHROMA_LOC_CENTER      },
 110                 { "411",      AV_PIX_FMT_YUV411P,   AVCHROMA_LOC_UNSPECIFIED },
 111                 { "422",      AV_PIX_FMT_YUV422P,   AVCHROMA_LOC_UNSPECIFIED },
 112                 { "444alpha", AV_PIX_FMT_YUVA444P,  AVCHROMA_LOC_UNSPECIFIED },
 113                 { "444",      AV_PIX_FMT_YUV444P,   AVCHROMA_LOC_UNSPECIFIED },
 114                 { "mono16",   AV_PIX_FMT_GRAY16,    AVCHROMA_LOC_UNSPECIFIED },
 115                 { "mono12",   AV_PIX_FMT_GRAY12,    AVCHROMA_LOC_UNSPECIFIED },
 116                 { "mono10",   AV_PIX_FMT_GRAY10,    AVCHROMA_LOC_UNSPECIFIED },
 117                 { "mono9",    AV_PIX_FMT_GRAY9,     AVCHROMA_LOC_UNSPECIFIED },
 118                 { "mono",     AV_PIX_FMT_GRAY8,     AVCHROMA_LOC_UNSPECIFIED },
 119             };
 120             for (i = 0; i < FF_ARRAY_ELEMS(pix_fmt_array); i++) {
 121                 if (av_strstart(tokstart, pix_fmt_array[i].name, NULL)) {
 122                     pix_fmt = pix_fmt_array[i].pix_fmt;
 123                     if (pix_fmt_array[i].chroma_loc != AVCHROMA_LOC_UNSPECIFIED)
 124                         chroma_sample_location = pix_fmt_array[i].chroma_loc;
 125                     break;
 126                 }
 127             }
 128             if (i == FF_ARRAY_ELEMS(pix_fmt_array)) {
 129                 av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains an unknown "
 130                        "pixel format.\n");
 131                 return AVERROR_INVALIDDATA;
 132             }
 133             while (tokstart < header_end && *tokstart != 0x20)
 134                 tokstart++;
 135             break;
 136         }
 137         case 'I': // Interlace type
 138             switch (*tokstart++){
 139             case '?':
 140                 field_order = AV_FIELD_UNKNOWN;
 141                 break;
 142             case 'p':
 143                 field_order = AV_FIELD_PROGRESSIVE;
 144                 break;
 145             case 't':
 146                 field_order = AV_FIELD_TT;
 147                 break;
 148             case 'b':
 149                 field_order = AV_FIELD_BB;
 150                 break;
 151             case 'm':
 152                 av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains mixed "
 153                        "interlaced and non-interlaced frames.\n");
 154             default:
 155                 av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
 156                 return AVERROR(EINVAL);
 157             }
 158             break;
 159         case 'F': // Frame rate
 160             sscanf(tokstart, "%d:%d", &raten, &rated); // 0:0 if unknown
 161             while (tokstart < header_end && *tokstart != 0x20)
 162                 tokstart++;
 163             break;
 164         case 'A': // Pixel aspect
 165             sscanf(tokstart, "%d:%d", &aspectn, &aspectd); // 0:0 if unknown
 166             while (tokstart < header_end && *tokstart != 0x20)
 167                 tokstart++;
 168             break;
 169         case 'X': // Vendor extensions
 170             if (strncmp("YSCSS=", tokstart, 6) == 0) {
 171                 static const struct {
 172 #define MAX_PIX_FMT_LENGTH 8
 173                     char name[MAX_PIX_FMT_LENGTH + 1];
 174 #undef MAX_PIX_FMT_LENGTH
 175                     enum AVPixelFormat pix_fmt;
 176                 } pix_fmt_array[] = {
 177                     { "420JPEG",  AV_PIX_FMT_YUV420P   },
 178                     { "420MPEG2", AV_PIX_FMT_YUV420P   },
 179                     { "420PALDV", AV_PIX_FMT_YUV420P   },
 180                     { "420P9",    AV_PIX_FMT_YUV420P9  },
 181                     { "422P9",    AV_PIX_FMT_YUV422P9  },
 182                     { "444P9",    AV_PIX_FMT_YUV444P9  },
 183                     { "420P10",   AV_PIX_FMT_YUV420P10 },
 184                     { "444P10",   AV_PIX_FMT_YUV444P10 },
 185                     { "420P12",   AV_PIX_FMT_YUV420P12 },
 186                     { "422P12",   AV_PIX_FMT_YUV422P12 },
 187                     { "444P12",   AV_PIX_FMT_YUV444P12 },
 188                     { "420P14",   AV_PIX_FMT_YUV420P14 },
 189                     { "422P14",   AV_PIX_FMT_YUV422P14 },
 190                     { "444P14",   AV_PIX_FMT_YUV444P14 },
 191                     { "420P16",   AV_PIX_FMT_YUV420P16 },
 192                     { "422P16",   AV_PIX_FMT_YUV422P16 },
 193                     { "444P16",   AV_PIX_FMT_YUV444P16 },
 194                     { "411",      AV_PIX_FMT_YUV411P   },
 195                     { "422",      AV_PIX_FMT_YUV422P   },
 196                     { "444",      AV_PIX_FMT_YUV444P   },
 197                 };
 198                 // Older nonstandard pixel format representation
 199                 tokstart += 6;
 200                 for (size_t i = 0; i < FF_ARRAY_ELEMS(pix_fmt_array); i++)
 201                     if (av_strstart(tokstart, pix_fmt_array[i].name, NULL)) {
 202                         alt_pix_fmt = pix_fmt_array[i].pix_fmt;
 203                         break;
 204                     }
 205             } else if (strncmp("COLORRANGE=", tokstart, 11) == 0) {
 206               tokstart += 11;
 207               if (strncmp("FULL",tokstart, 4) == 0)
 208                   color_range = AVCOL_RANGE_JPEG;
 209               else if (strncmp("LIMITED", tokstart, 7) == 0)
 210                   color_range = AVCOL_RANGE_MPEG;
 211             }
 212             while (tokstart < header_end && *tokstart != 0x20)
 213                 tokstart++;
 214             break;
 215         }
 216     }
 217
 218     if (width == -1 || height == -1) {
 219         av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
 220         return AVERROR_INVALIDDATA;
 221     }
 222
 223     if (pix_fmt == AV_PIX_FMT_NONE) {
 224         if (alt_pix_fmt == AV_PIX_FMT_NONE)
 225             pix_fmt = AV_PIX_FMT_YUV420P;
 226         else
 227             pix_fmt = alt_pix_fmt;
 228     }
 229
 230     if (raten <= 0 || rated <= 0) {
 231         // Frame rate unknown
 232         raten = 25;
 233         rated = 1;
 234     }
 235
 236     if (aspectn == 0 && aspectd == 0) {
 237         // Pixel aspect unknown
 238         aspectd = 1;
 239     }
 240
 241     st = avformat_new_stream(s, NULL);
 242     if (!st)
 243         return AVERROR(ENOMEM);
 244     st->codecpar->width  = width;
 245     st->codecpar->height = height;
 246     av_reduce(&raten, &rated, raten, rated, (1UL << 31) - 1);
 247     avpriv_set_pts_info(st, 64, rated, raten);
 248     st->avg_frame_rate                = av_inv_q(st->time_base);
 249     st->codecpar->format              = pix_fmt;
 250     st->codecpar->codec_type          = AVMEDIA_TYPE_VIDEO;
 251     st->codecpar->codec_id            = AV_CODEC_ID_RAWVIDEO;
 252     st->sample_aspect_ratio           = (AVRational){ aspectn, aspectd };
 253     st->codecpar->chroma_location     = chroma_sample_location;
 254     st->codecpar->color_range         = color_range;
 255     st->codecpar->field_order         = field_order;
 256     s->packet_size = av_image_get_buffer_size(st->codecpar->format, width, height, 1) + Y4M_FRAME_MAGIC_LEN;
 257     if ((int) s->packet_size < 0)
 258         return s->packet_size;
 259     ffformatcontext(s)->data_offset = data_offset = avio_tell(pb);
 260
 261     st->duration = (avio_size(pb) - data_offset) / s->packet_size;
 262
 263     return 0;
 264 }
 265
 266 static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
 267 {
 268     int i;
 269     char header[MAX_FRAME_HEADER+1];
 270     int ret;
 271     int64_t off = avio_tell(s->pb);
 272
 273     for (i = 0; i < MAX_FRAME_HEADER; i++) {
 274         header[i] = avio_r8(s->pb);
 275         if (header[i] == '\n') {
 276             header[i + 1] = 0;
 277             break;
 278         }
 279     }
 280     if (s->pb->error)
 281         return s->pb->error;
 282     else if (s->pb->eof_reached)
 283         return AVERROR_EOF;
 284     else if (i == MAX_FRAME_HEADER)
 285         return AVERROR_INVALIDDATA;
 286
 287     if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC)))
 288         return AVERROR_INVALIDDATA;
 289
 290     ret = av_get_packet(s->pb, pkt, s->packet_size - Y4M_FRAME_MAGIC_LEN);
 291     if (ret < 0)
 292         return ret;
 293     else if (ret != s->packet_size - Y4M_FRAME_MAGIC_LEN) {
 294         return s->pb->eof_reached ? AVERROR_EOF : AVERROR_INVALIDDATA;
 295     }
 296     pkt->stream_index = 0;
 297     pkt->pts = (off - ffformatcontext(s)->data_offset) / s->packet_size;
 298     pkt->duration = 1;
 299     return 0;
 300 }
 301
 302 static int yuv4_read_seek(AVFormatContext *s, int stream_index,
 303                           int64_t pts, int flags)
 304 {
 305     int64_t pos;
 306
 307     if (flags & AVSEEK_FLAG_BACKWARD)
 308         pts = FFMAX(0, pts - 1);
 309     if (pts < 0)
 310         return -1;
 311     pos = pts * s->packet_size;
 312
 313     if (avio_seek(s->pb, pos + ffformatcontext(s)->data_offset, SEEK_SET) < 0)
 314         return -1;
 315     return 0;
 316 }
 317
 318 static int yuv4_probe(const AVProbeData *pd)
 319 {
 320     /* check file header */
 321     if (strncmp(pd->buf, Y4M_MAGIC, sizeof(Y4M_MAGIC) - 1) == 0)
 322         return AVPROBE_SCORE_MAX;
 323     else
 324         return 0;
 325 }
 326
 327 const FFInputFormat ff_yuv4mpegpipe_demuxer = {
 328     .p.name         = "yuv4mpegpipe",
 329     .p.long_name    = NULL_IF_CONFIG_SMALL("YUV4MPEG pipe"),
 330     .p.extensions   = "y4m",
 331     .read_probe     = yuv4_probe,
 332     .read_header    = yuv4_read_header,
 333     .read_packet    = yuv4_read_packet,
 334     .read_seek      = yuv4_read_seek,
 335 };